Passive decoy state quantum key distribution: Closing the gap to perfect sources

Details Passive decoy state quantum key distribution: Closing the gap to perfect sources Passive decoy state quantum key distribution: Closing the gap to perfect sources

2006-09-26

arxiv.org/abs/quant-ph/0609195v2

Phys. Rev. A 75, 050305(R) (2007)

Physics

Quantum Physics

4 pages, 3 figures. State preparation corrected

Scientific paper

10.1103/PhysRevA.75.050305

We propose a quantum key distribution scheme which closely matches the performance of a perfect single photon source. It nearly attains the physical upper bound in terms of key generation rate and maximally achievable distance. Our scheme relies on a practical setup based on a parametric downconversion source and present-day, non-ideal photon-number detection. Arbitrary experimental imperfections which lead to bit errors are included. We select decoy states by classical post-processing. This allows to improve the effective signal statistics and achievable distance.

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